The mission says in a statement that the two injured peacekeepers were immediately evacuated today after their vehicles hit the explosives about 15 kilometers (9 miles) outside of Aguelhok.
A UN official says the peacekeepers were Chadian. The official spoke on condition of anonymity because he was not permitted to speak to the press on the matter.
The UN condemned the attack and others by Islamic extremists.
The peacekeeping mission in Mali is the deadliest of the UN's 16 global peacekeeping operations.